To solve this, first take 10% of 600, which is 60. Then you'll need to find an addition 5% to make 15%, and you can find this easily by dividing 60 in half (because 10% is 60, so 5% must be half of that number) which is 30. Then you just have to add the two together to get a total of $90.
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$600.
$60.00
15 percent of 40 dollars = $615% of $40= 15% * $40= 0.15 * $40= $6
3 dollars is 15% of $20.
To find 15 percent of 400 dollars, you would first convert 15 percent to a decimal by dividing it by 100, which gives you 0.15. Then, you multiply 0.15 by 400 to calculate the answer. This gives you 60 dollars, which is 15 percent of 400 dollars.